The use of centrifugation in wastewater treatment to separate liquids has not typically been an economical process due primarily to the high capital cost~1 compared to other liquid/liquid separation processes such as gravity settling. However, its sue may be justified in wastewater treatment applications involving stable mixtures of immiscible liquids. Centrifugation has been proven by the petroleum~2 and dairy~3 industries as a successful physical separation process for immioscible liquid mixtures.
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